It was Mira for me, I had no idea villager pics were a thing at the time so I thought it was something very special that only the one villager your the best of friends with would give you, I cherished that thing and I still do.
I can't be 100% but I am almost positive Lolly was the first to give me her pic.
I remember it came out of nowhere.. I gave her some random item for her house and she gave me her pic.
It was pretty exciting. :3
I got Pecan's pic after I did some random task she asked me to do. It was a very nice surprise because i had been trying to get it for months and even though i did get it on April fools it didn't really feel very.. special. So when she actually gave it to me for real I was sooo happy